Over the course of his twenty-three year reign, Baasha allied Israel with Syria and endeavored to strangle Judah's trade by fortifying Ramah, a city five miles north of Jerusalem. King Asa of Judah then bribed King Ben-hadad of Syria to switch sides and attack Israel, prompting the loss of extensive territory in Dan and Naphtali northwest of the Sea of Galilee. Baasha was forced to withdraw from Ramah.
Though Baasha remained in power for life, he was not without his opponents. The prophet Jehu, the son of Hanani, foretold the destruction of his dynasty, which came to pass with the assassination of Baasha's son Elah, two years into his reign.
Baasha's story is told in 1 Kings 15:16 through 16:7.